G1 is bad for me

[Andrei Pozolotin]

    Ramki,

    got it; thank you;

    Andrei


-------- Original Message  --------
Subject: Re: G1 is bad for me
From: Y. Srinivas Ramakrishna <Y.S.Ramakrishna at Sun.COM>
To: Andrei Pozolotin <andrei.pozolotin at gmail.com>
Cc: hotspot-gc-use at openjdk.java.net
Date: Mon 22 Feb 2010 09:45:00 AM CST
> Sorry, we haven't responded in depth because we are busy with other
> high priority stuff. Please follow up with your support
> contacts for urgent issues.
>
> If you subscribe to hotspot-gc-dev at openjdk.java.net you will
> get all G1 integration notifications; those then usually flow into
> the next JDK7 build in the subsequent week or two.
>
> regards.
> -- ramki
>
> Andrei Pozolotin wrote:
>>     Tony, Ramki, Jon, hello;
>>
>>     1) I take it that you silence means that "we are not there yet"
>> with G1;
>>     understandable - thank you for your efforts!
>>
>>     2) there are some 82 people on this mail list who seem to be really
>>     interested
>>     in GC and G1 specifically; can I ask to you to make brief
>>     announcements here
>>     when JDK 7 weekly build brings some new G1 advances, so we can test
>>     it right away?
>>
>>     Thank you;
>>
>>     Andrei
>>
>>
>> -------- Original Message  --------
>> Subject: Re: G1 is bad for me
>> From: Y. Srinivas Ramakrishna <Y.S.Ramakrishna at Sun.COM>
>> To: Andrei Pozolotin <andrei.pozolotin at gmail.com>
>> Cc: hotspot-gc-use at openjdk.java.net
>> Date: Thu 18 Feb 2010 11:37:56 AM CST
>>> Hi Andrei -- please use the latest hs17 JVM which you can get from JDK
>>> 7. There have been
>>> many improvements (and bug fixes) since the 6u18/hs16 that you are
>>> using below.
>>> Most importantly, please add -XX:-ReduceInitialCardMarks to work
>>> around a regression
>>> introduced in 6u18/hs16, as described in the 6u18 release notes.
>>> As re optimal settings (these may be quite different from shapes that
>>> helped with CMS
>>> for example), i'll let others w/more (tuning and other) experience
>>> w/G1 comment.
>>>
>>> -- ramki
>>>
>>> On 02/18/10 08:56, Andrei Pozolotin wrote:
>>>>     Ramki, Jon, hi;
>>>>
>>>>     I read everyting I could find on G1:
>>>>     http://www.google.com/patents/about?id=j5SpAAAAEBAJ&dq=7,340,494
>>>>   
>>>> http://developers.sun.com/learning/javaoneonline/2008/pdf/TS-5419.pdf
>>>>     http://research.sun.com/jtech/pubs/04-g1-paper-ismm.pdf
>>>>     http://blogs.sun.com/sunabl/entry/the_new_g1_collector
>>>>     http://blogs.sun.com/jonthecollector/entry/our_collectors
>>>>     etc, etc, etc,
>>>>
>>>>     got myself excited - looks great on paper!
>>>>
>>>>     and I followed Albert's advice, while trying to mimic my CMS
>>>> settings:
>>>>     http://blogs.sun.com/sunabl/entry/the_new_g1_collector
>>>>
>>>>     -Xms3700m
>>>>     -Xmx3700m
>>>>     -XX:PermSize=50m
>>>>     -XX:MaxPermSize=50m
>>>>     -XX:+UnlockExperimentalVMOptions
>>>>     -XX:+UseG1GC
>>>>     -XX:G1YoungGenSize=900m
>>>>     -XX:SurvivorRatio=2
>>>>     -XX:+G1ParallelRSetUpdatingEnabled
>>>>     -XX:+G1ParallelRSetScanningEnabled
>>>>
>>>>     results:
>>>>
>>>>     1) pauses are 1000 milliseconds or more;
>>>>
>>>>     2) reproducible crashes after 3 minutes under load;
>>>>
>>>>     logs attached;
>>>>
>>>>     am I missing something obvious?
>>>>     like do I need to switch to older / specific JVM build?
>>>>
>>>>     per Tony, this was already working fine for a neighbour of mine
>>>> in 2008:
>>>>   
>>>> http://developers.sun.com/learning/javaoneonline/2008/pdf/TS-5419.pdf
>>>>
>>>>     Thank you;
>>>>
>>>>     Andrei
>>>>
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>>
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>>>
>>
>>
>
>

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